Sound Ratings
Ratings for the Effective sound control of WECU cork underlayment are outlined below:
IIC Ratings for WECU Cork Underlayment
The Impact Insulation Class (IIC) ratings in the tables below demonstrate how WECU Cork underlayment provides superior sound control across various scenarios:
IIC on Wood Joist – Light Weight Concrete Floor System *
| TEST REFERENCE | SUBFLOOR | Susp. Ceiling | WECU | Floor Covering | IIC |
| RAL-TL91-95 & RAL-IN91-3 | 1.5″ light wt. concrete on 5/8″ plywood | NO | Soundless+ (½”) | Ceramic Tile | 52 |
| RAL-TL91-89 & RAL-IN91-4 | 1.5″ light wt. concrete on 5/8″ plywood | YES | Soundless+ (½”) | Ceramic Tile | 56 |
| 3013567-002A | 1.5″ gypcrete on 5/8″ plywood | NO | Soundless (6mm) | Wood | 51 |
| 3138449CRT-002B | 1 1/2″ lightweight concrete on 5/8″ plywood | NO | Silently+ (2mm) | Laminate | 55 |
IIC on a 6″ Concrete Slab **
| TEST REFERENCE | SUBFLOOR | Susp. Ceiling | WECU | Floor Covering | IIC |
| J20011278-001 | 6″ CONCRETE | YES | Soundless (6mm) | Ceramic Tile | 56 |
| CK8511.02A | 6″ CONCRETE | YES | Soundless (6mm) | Tile | 56 |
| J200114367-001 | 6″ CONCRETE | YES | Soundless+ (½”) | Ceramic Tile | 60 |
| CK214.0211 | 6″ CONCRETE | NO | Soundless+ (½”) | Ceramic Tile | 53 |
| CK214.0211 | 6″ CONCRETE | YES | Soundless+ (½”) | Ceramic Tile | 63 |
| J20011278-001 | 6″ CONCRETE | YES | Soundless (6mm) | Laminate | 59 |
| 3013567-001A | 6″ CONCRETE | YES | Crackless+ (3/64″) | Laminate | 58 |
| 3026189-001A | 6″ CONCRETE | NO | Soundless (6mm) | Laminate | 50 |
| J20011278-001 | 6″ CONCRETE | YES | Soundless (6mm) | Wood | 59 |
| I-20581-0228 | 6″ CONCRETE | NO | Soundless (6mm) | Hardwood | 52 |
| I-20580-0228 | 6″ CONCRETE | YES | Soundless (6mm) | Hardwood | 59 |
Delta IIC on a 6″ Concrete Slab – No Suspended Ceiling
| TEST REFERENCE | SUBFLOOR | WECU | Floor Covering | Delta IIC |
| 3026189-004 | 6″ CONCRETE | Soundless (6mm) | Ceramic Tile | 19 |
| 3026189-005 | 6″ CONCRETE | Soundless+ (½”) | Ceramic Tile | 20 |
| 3026189-001B | 6″ CONCRETE | WECU (3.2mm) | Laminate | 26 |
| 3026189-002A | 6″ CONCRETE | Soundless (6mm) | Wood | 20 |
| 3026189-002C | 6″ CONCRETE | Soundless (½”) | Wood | 21 |
| 100661236CRT-002 | 6″ CONCRETE | Silently-LVT | Luxury Vinyl Tile | 20 |
Field Testing Data (FIIC)
| TEST REFERENCE | SUBFLOOR | Susp. Ceiling | WECU | Floor Covering | IIC |
| Cityfront Terrace | 8″ CONCRETE | NO | Soundless+ (½”) | Marble Tile | 50 |
| Comstock Apts. | 6″ CONCRETE | NO | Soundless+ (½”) | Hardwood | 59 |
| The Meridian | 6″ CONCRETE | YES | Soundless+ (½”) | Marble Tile | 67 |
| 850 E. Ocean Blvd. | 8″ CONCRETE | NO | WECU (1/8″) | Laminate | 59 |
| 850 E. Ocean Blvd. | 8″ CONCRETE | NO | WECU (6mm) | Hardwood | 56 |
| Standard Building Code | 50 | 50 | 0 |
*Tests performed by Riverbank Acoustical laboratories in explicit conformity with ASTM Designations E90-90, E413-87, E492-90, E989-89 and E413-87.
**Tests using tile performed by Cedar Knolls Acoustical Labs in explicit conformity with ASTM Designations E492-86, E492-77, E989-84. Tests using hardwood Flooring, performed by Armstrong Acoustics Laboratory in explicit conformity with ASTM designations E989-89 and E492-90STC ratings based on tests performed on bare 6″ slab.
Contact us for for more information about WECU cork underlayment sound ratings.
Additional Cork Underlayment Resources
To learn more, see the additional resources available on our cork underlayment page.